Melting furnace



Patented Jan. l1, 192.7.

UNITED- STATES 1,614,085 PATENT OFFICE.

WILLIAM B. RUNYAN, OF DAYTON, OHIO, ASSIGNOR TO THEDAYTON MALLEABLE IRON COMPANY, vOF DAYTON, OHIO, A CORPORATION 'OF OHIO.

MELTING FURNACE.

Application filed January This invention relates to furnaces, and more particularly to an improved type of melting furnace for Vuse inthe melting of iron, and the like.

One of the principal objects of the invention is to provide an improved type of melting furnace, which is particularly adapted for the utilization of powdered coal as,V7 a fuel.

Other objects and advantages of the invention will be apparent from the description thereof set out below, when taken in in connection with accompanying drawing.

In the drawing in which like characters 7 of reference designate like parts throughout the several views thereof,

Fig. 1 is'a horizontal 'sectional view, of a furnace constructed in accorda-nce with this invention, the view being substantially along the line 1-1 of Fig. 2.

Fig. 2 is a vertical sectional View through the form of furnace shown in Fig. 1 the viedw being along the line 2-2 of Fig. 1;

Cil

through a slightly modified form of furnace, having a single burner instead of a plurality of burners, the view being other-- wise substantially the same as is Fig. 1.

-The furnace shown herein as constituting a preferred embodiment of this invention is intended to be used primarily in the melting of iron, in malleable Jfoundries and like places, and is particularly designed to operate upon powdered coal as a fuel.

Powdered coal, as it is generally used, is very finely ground, and in `burning is admiXed with air and introduced into the com bustion space at high velocity. In the form 0 of furnace shown in Fig.' 1 the combustion chamber 10 is provided with an arch or wall 11 which is `inclined downwardly from one side of the furnace to the other, the material to be melted being placed upon the hearth 5 12. Extending through the wall of the furnace, into the combustion space, at one side, and adjacent the higher side of the arch or top wall, are two burners 15, (in the modification shown in Figs. 1 and 2), each of which is adapted for the burning of powdered fuel. The construction of the burner is immaterial so long as an efficient type of burner is used, and consequently' 5 these burners are illustrateddlagrammatically; but each ofthese burners should pref- Fig. 3 is a horizontal 'sectional view 9, 1924. Serial No. 685,188.

erably be inclined downwardly in the gen-- eral direction of downward inclination of the arch. l

The opening or passage 1F, which connects the combustion space to the fine or stack 17 is positioned at the samc side of thc combustion chamber as the burners. During operation the powdered fuel and combustion air are introduced under high Velocity through the burners 15, the-burning gus and 6J the hot products of combustion sweeping downwardly along the inclined arch or wall 11 and completely across the combustion space to ilnpinge upon the opposite side wall whence they are diverted and turned back as shown by the arrows in Figs. 1 and 2, sweeping across the material to be\heated, and thence passing out through the opening 16 and the stack 17.

In Fig. 3 is shown a slightly modified 75 form of furnacein which only a single burner is provided, the stack in this case being connected to the combustion chamber at one end and the burner at the other, the hot products of combustion sweeping across the combustion space and back-following substantially the course indicated by the arrows. In this form, also, the combustion chamber is tapered from the burner side to the other side, as clearly shown in the drawing, this construction .tending to further the circulation of the hot products of combustion.

But whether the furnace is provided with one burner, or with a plurality of burners, the operation is substantially the same, the powedered coal burnin within the combustion space, the hot pro uctssweeping downwardly along the wall l1 and across the combustion space, and being diverted and returned backwardly across the combustion space and out through the opening 16. As a result of this construction very efficient heating of the material upon the hearth 12 is secured.

' While the forms of apparatus herein described constitute preferred embodiments of` the invention, it is to be understood that the invention is not limited to these precise forms of apparatus, and that changes may 10 be made in either without departing from the scope of the invention which is defined in the appended claims.

What is claimed is:

1. A'melting furnace of the character de- 110 scribed constructed `for utilizing powdered fuel, colnprizing a combustion space, a. hearth within said combustion space for supporting the material to-be heated, an arch or top wall for said combustion space inclined downwardly from one side of the combustion spaceto the other, a plurality of burners for utilizing powdered fuel extending through the side wall of the furnace which is adjacent to the upper side of the inclined top wall, said burners extending into the combustion space, and being remotelypositioned with respect to each other, and arranged to introduce substantially parallell streams of fuel into the combustion space, and a stack connected to the combustion space at the burner side thereof, and at the hearth level'.

2. A melting;- furnace of the character described comprising a combustion space` a hearth therein for supporting the material to be heated, a top wall inclined downwardly across the said combustion space, two burners extending through one side wall of the furnace and opening into the combustion space adjacent the higher side of the inclined vtop wall, and arranged to introduce substantially parallel strealnsof fuel into the combustion space', and a stack connected to the combustion space by means of an open- 30 comprising a combustion space, having the 35 end wallsthereof converging from the burner side to the other slde, a hearth within said .combustion space for receivingr the material ito be heated, an arch or top wall inclined downwardly from one side of the combustion 40 space to the other, a fuel burner extending into the combustion spaceat one side thereof7 and inclined downwardly in the lgeneral direction of downward inclination of the arch,

and a stack connected to the said combustion 45 space at the burner side thereof.

In testimony whereof I hereto atiix my signature.

WILLIAM B. RUNYAN. 

